<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>drag</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      body {
        padding: 20px;
      }

      /* 图形拼图验证码 */
      .check {
        width: 400px;
        height: 300px;
        background-repeat: no-repeat;
        background-size: 100% 100%;
        background-image: url(./img/验证图.jpg);
        position: relative;
      }

      .check::before {
        content: "";
        width: 50px;
        height: 50px;
        background: rgba(0, 0, 0, 0.5);
        border: 1px solid #fff;
        position: absolute;
        top: 100px;
        left: 280px;
      }

      .check-child {
        content: "";
        width: 50px;
        height: 50px;
        border: 1px solid #fff;
        background-image: inherit;
        background-repeat: inherit;
        background-size: 400px 300px;
        background-position: -280px -100px;
        position: absolute;
        top: 100px;
        left: 0;
      }
      /* 拖动条 */
      .drag {
        width: 400px;
        height: 50px;
        background-color: #e3e3e3;
        margin-top: 10px;
        position: relative;
      }
      /* 可拖动的盒子 */
      .drag-child {
        width: 50px;
        height: 50px;
        background-color: aquamarine;
        z-index: 10;
        position: absolute;
        top: 0;
        left: 0;
      }
      /* 提示文字说明 */
      .drag-tips {
        display: flex;
        align-items: center;
        justify-content: end;
        width: 95%;
        height: 100%;
        margin: 0 auto;
        font-size: 12px;
        color: #8a8a8a;
        user-select: none;
        z-index: 1;
        position: absolute;
        top: 0;
        left: 0;
      }

      @keyframes move {
        to {
          transform: translateX(0);
        }
      }
    </style>
  </head>
  <body>
    <!-- 图形校验区域 -->
    <div class="check">
      <!-- 被校验区域 -->
      <div class="check-child"></div>
    </div>
    <!-- 拖动条 -->
    <div class="drag">
      <!-- 操作说明 -->
      <div class="drag-tips">
        <span>按住左边按钮向右拖动完成上方图像验证</span>
      </div>
      <!-- 可拖动的盒子 -->
      <div class="drag-child"></div>
    </div>
  </body>
  <script>
    // 获取元素实例
    const drag = document.querySelector(".drag-child");

    // 图形被校验区域
    const check = document.querySelector(".check-child");

    // 通过校验回调
    const success = () => {
      console.log("通过校验");
    };

    // 声明鼠标按下事件
    const dragMouseDown = (event) => {
      // 添加鼠标移动事件
      document.addEventListener("mousemove", dragMouseMove);
    };
    // 监听鼠标移动事件
    const dragMouseMove = (event) => {
      // 获取当前 x 轴坐标
      const { pageX } = event;
      if (pageX < 0 || pageX > 350) {
        return;
      }
      // 修改可移动盒子的 x 轴坐标
      drag.style.transform = `translateX(${pageX}px)`;

      // 修改被校验区域坐标
      check.style.transform = `translateX(${pageX}px)`;

      if (pageX >= 278 && pageX <= 285) {
        // 执行回调
        success();
      }
    };
    // 结束鼠标监听事件
    const dragMouseUP = (event) => {
      // 移除鼠标移动事件
      document.removeEventListener("mousemove", dragMouseMove);

      // 获取当前 x 轴坐标
      const { pageX } = event;

      if (pageX < 278 || pageX > 285) {
        // 修改可移动盒子的 x 轴坐标
        drag.style.animation = "move 0.5s ease-in-out";
        // 修改被校验区域坐标
        check.style.animation = "move 0.5s ease-in-out";

        // 动画结束监听回调
        const animationEnd = () => {
          // 修改可移动盒子的 x 轴坐标
          drag.style.transform = `translateX(${0}px)`;
          // 修改被校验区域坐标
          check.style.transform = `translateX(${0}px)`;

          // 清除动画属性
          drag.style.animation = "";
          check.style.animation = "";
          // 移出动画结束监听
          document.removeEventListener("animationend", animationEnd);
        };
        // 添加动画结束监听
        document.addEventListener("animationend", animationEnd);
      }
    };

    // 添加鼠标按下事件
    document.addEventListener("mousedown", dragMouseDown);
    // 添加鼠标弹起事件
    document.addEventListener("mouseup", dragMouseUP);
  </script>
</html>
